li, ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.side-menu {
    font-size: 12px;
}

.first-menu {
    width: 90px;
    height: 100%;
    color: #cccccc;
    display: inline-block;

    li {
        width: 100%;
        height: 40px;
        line-height: 40px;
        text-indent: 6px;
        overflow: hidden;
        cursor: pointer;
        position: relative;

        &:hover {
            color: #FFFFFF;
        }
    }
}

.child-menu {
    height: 100%;
    width: 110px;
    float: right;
    display: inline-block;
    background-color: #EAEDF1;
    border-left: 1px solid #e5e5e5;

    li {
        height: 40px;
        width: 100%;
        line-height: 40px;
        text-indent: 16px;
        overflow: hidden;
        cursor: pointer;
        list-style: circle;
        border: 0;
        outline: none;
        border-bottom: 1px solid #e5e5e5;

        &:first-child {
            height: 50px;
            line-height: 50px;
            font-size: 13px;
            background-color: #F2F2F2;
            color: #999999;
            text-align: center;
            text-indent: 0;
            list-style: none;

            &::before {
                content: '';
            }
        }

        &::before {
            content: '•';
            margin-right: 2px;
        }
    }

}

.first-menu-li-select {
    color: #FFFFFF;

    &:after {
        display: block;
        content: '';
        border-width: 6px 6px 6px 6px;
        border-style: solid;
        border-color: transparent #F2F2F2 transparent transparent;
        /* 定位 */
        position: absolute;
        top: 15px;
        right: 0;
    }
}
